Fig. 5: SHG characterization of atomically thin Cs3Bi2Br9.
From: Colloid driven low supersaturation crystallization for atomically thin Bismuth halide perovskite
a Schematic diagram of SHG measurement of atomically thin Cs3Bi2Br9. b Polarization-resolved SHG spectra of the a three-layered Cs3Bi2Br9, revealing its underlying threefold symmetry. c Layer-dependent SHG verified the systematically stronger signals from odd-layer Cs3Bi2Br9 due to inversion symmetry breaking than from even-layer Cs3Bi2Br9. The SHG intensity error bars represent the standard deviation. d The optical images of the stacking 6-layered and the 7-layered Cs3Bi2Br9 crystal. e The SHG intensity mapping of the region in a. f The SHG intensity of the three regions. The inset diagram shows three regions with stacking angle of θ = 0°. The SHG intensity error bars represent the standard deviation. Source data are provided as a Source Data file.
